Very interesting discussion! I live in Vermont and I'm planning on putting her up within the next week or two.
Below is a photo of what my car looked like last year (my first year of ownership).
I took the following steps:
#1-Cleaned the car in and out very well.
#2-Put gas stabilizer in with a full tank of gas.
#3-Used a battery minder with the battery still hooked up in the trunk.

#4-Changed the oil and filter the week before putting it away.
#5-Placed a dehumidfying pack in the interior and trunk.
#6-Placed moth ball packets in the car and mouse traps around the garage.
(Killed 6)
#7-Drove car onto plastic tarp and used car cover that came with car.
#8-Folded the tarp up and clipped it to the cover.
My spider shares the garage with a Jeep Grand Cherokee that does heavy winter duty and the snow often melts in the garage so I try to protect the bottom half of the car.
#9-Put a ball of aluminum foil in the tailpipe and covered the end with more foil.
The car started right up in April, first try just like when I put it away.
This year I think there will be some additions to my routine as well as some corrections like "take the battery out of the car".
The IAP list seems a like little overkill, but still very good advice.
I would like to know why putting a plastic vapor barrier between the concrete and my car is a bad thing, not arguing mind you... just would like to know.
